1. Those who know, do. Those that understand, teach.
2. The high-minded man must care more for the truth than for what people think.
3. Learning is not child's play; we cannot learn without pain.
4. It is not once nor twice but times without number that the same ideas make their appearance in the world.
5. The pleasures arising from thinking and learning will make us think and learn all the more.
6. It is not once nor twice but times without number that the same ideas make their appearance in the world.
7. The more you know, the more you know you don't know.
8. All men by nature desire knowledge.
9. Learning is an ornament in prosperity, a refuge in adversity, and a provision in old age.
10. Philosophy can make people sick.
11. It is absurd to hold that a man should be ashamed of an inability to defend himself with his limbs, but not ashamed of an inability to defend himself with speech and reason; for the use of rational speech is more distinctive of a human being than the use of his limbs.